Improved PMSM Speed Control Strategy with Non-singular Fast Terminal Sliding Mode Control Based on Real-Time Simulation

The permanent magnet synchronous motor (PMSM) is a complex and strongly coupled nonlinear system. To enhance the dynamic quality of the PMSM speed control system, this paper proposes an improved sliding mode control strategy. A non-singular fast terminal sliding mode control (NFTSMC) is designed to regulate the speed, which can significantly improve the convergence speed. In order to reduce the chattering of the system, a novel sliding mode reaching law is presented. Based on the traditional exponential reaching law, the sigmoid function is used instead of the symbolic function and the system state variable is introduced. Through the stability analysis, it is demonstrated that the proposed method can make the system stable. Simulation results verify the effectiveness and robustness of the proposed method. Finally, a real-time simulation platform of a PMSM speed control system is established using the Links-RT device. The experimental results show that the anti-disturbance capability and the stability of the system have been improved.